A tiny bump in progesterone production causes a spike in the hormones LH luteinizing hormone and FSH follicle-stimulating hormone. This rise in LH is called the LH surge. This is what ovulation predictor kits are trying to detect. The egg usually releases about 36 hours after the LH surge begins. Ovulation typically occurs around day 14 in a 28 day cycle. The egg will live up to 24 hours unless it is fertilized.
If the egg is fertilized, it becomes an embryo and travels down the fallopian tube into the uterus where implantation and pregnancy begin see window of implantation above. Implantation typically occurs about seven days after ovulation. Progesterone will go on to play a vital role in pregnancy should it occur. If implantation does not occur, progesterone levels will decrease dramatically, which will lead to menstruation and the start of the next cycle. If a woman does not ovulate during a given cycle, the spike in progesterone does not happen as described above.
Instead, the growth processes driven by estrogen continue. This unchecked growth has a marked effect on her ability to get pregnant, but can also increase the risk of other complications. You also might want to try an over-the-counter ovulation kit. These kits test your urine for the surge in hormones that takes place before ovulation, which helps you identify when you're most likely to ovulate.
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